For silent videos you can replace -c:a aac by -an. uses ffprobe to extract metadata from multimedia container files in order to.
As sadly MP4 cannot contain sound encoded by a PCM (Pulse-Code Modulation) audio codec, we use AAC (Advanced Audio Coding): aac is FFmpeg’s native AAC encoder. When I convert png images to avi video ffmpeg is dropping frames. After that, you can get converted MKV to MP4 video lossless on Mac, PC and other platforms for free. ffmpeg -i mymovie.mkv -vcodec copy -acodec copy mymovie.mp4. And then you can run the following command to convert a MKV to a MP4 in Terminal. The audio codec is specified by -codec:audio, which is usually abbreviated as -c:a ( -codec:a or -c:audio are also possible). Find the MKV video you want to convert to MP4. The video codec is specified by -codec:video, which is usually abbreviated as -c:v ( -codec:v or -c:video are also possible). The extension for the Matroska container is. mp4 Command syntax ffmpeg starts the command -i input_file.mkv path, name and extension of the input file -c:v copy re-encodes the video stream using the same video codec -c:a aac re-encodes the audio stream using the AAC audio codec output_file.mp4 path, name and extension of the output file Discussion In this case even if your original file has 2 video tracks, 4 audios, mpeg2 video codec, or whatever, the output will always have the correct video and audio format and it will discard any other unwanted streams.Transform the container from Matroska to MP4. The best way to handle this would be to map the streams you need from the original file -map 0:v:0 (first video stream) -map 0:a:0 (first audio stream) and then use the codec selection to transcode into -c:v libx264 -c:a aac You were lucky that previously the video format on the original container was compatible with the mp4 container, but as you noticed it did not work this time. supports all popular formats, including MP4, WebM, MP3, MKV, and more. The root cause of the problem is the -c copy command, what it does is that it actually copy everything inside the original file and mux it to a new container, in your case mp4 and it also is copying all the other stuff (subtitles etc). FFmpeg has been compiled and tested with Microsoft Visual Studio 2013 SP2 and.
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